the Raspberry Pi 4 has six SPI controllers, six I2C controllers, and six UARTs – all on its 40-pin header. You can’t make use of all of these at once, but with up to four different connections ...

A new Raspberry Pi project has been published ... only the GY-91 shematic. Connect sensor through the GPIO. There is a very little manipulation to connect 4 pins of the sensor on the GPIO.

At the same time, the board can be fixed onto the 40-pin GPIO header that sits on most Raspberry Pi boards, including Raspberry Pi 4 and Raspberry Pi Zero. This lets users program the sensors and ...